Pump for suction feed systems



May 4 1926. 1,582,953

L. H. WHEELER PUMP FOR SUCTION FEED SYSTEMS Filed August 24 1922 2Sheets-Sheet 1 'May 4 1926. 1,582,953

L. H. WHEELER PUMP FOR SUCTION FEED SYSTEMS Filed August 24, 1922 2Sheets-Sheet 2 laonarczlfian 6mm Ze W6.

Patented May 4, 1926.

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LEONARD I-I. \VHEELER, OF CHICAGO, ILLINOIS, ASSIGNOR TO STEWART-W'ARNERSPEEDOMETER CORPORATION, OF CHICAGO, .ILLIPNOIS, .A' CORPORATION QF VIR-GINIA.

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Application filed August 24, 1922. Serial No. 583,951.

To all whom it may concern:

Be it known that I, LEONARD H. VVHEELER, a citizen of the United States,residing in the city of Chicago, in the county of Cook and State ofIllinois, have invented certain-new and useful Improvements in Pumps forSuetion Feed Systems, of which the following is a specification,reference being'had to'the accompanying drawings, forming a partthereof. 7 I

This invention relates to vacuum fuel feed systems for internalcombustion engines and its purpose is to provide a suction pump adaptedfor direct mechanical connection with a moving part of the engine so asto be actuated thereby. It consists of certain features and elements ofconstruction hereinafter described and shown in the drawings asindicated by the claims.

In the drawings:

Figure 1 is a diagrammatic side elevation of an engine and fuel feedsystem including a pump embodying this invention.

Figure 2 is a side elevation of the pump actuating 'means and a'vertical sectional view of the pump itself.

Figure 3 is a transverse section taken as indicated at line 33 on Figure2.

Figure t is a transversesection taken as indicated atline l l on Figure2.

Figure 5 is a top plan view of the pump shown in Figure 2, the valverods which actuate it appearing in section;

Figure 6 is a sideelevation of actuating means combined with a verticalsectional view of a modified form of pumping device.

Figure 7 is a transverse section-taken as indicated at line 77 on Figure6.

Figure 8 is a transverse section taken as indicated at line 88 on Figure6;

Figure 1 illustrates conventionally an internal combustion engine, 1,provided with a carburetor, 2, which is' fed through a pipe, 3, leadingfrom the vacuum tank, 4', which may be of the USUZLlWll understoodconstruction. Said vacuum tank is designed to elevate liquid fuel from,the main supply tank, 5, through a pipe, 6, andis operated bysuctionacting through a suction pipe, 7, connected into the top of thetank'f l. A common arrangement is to tap the suction pipe, 7, into theintake manifold, 8, and rely upon the suction of the intake manifold foractuating the feed mechanism in the tank, The present invention providesa meehaut cally driven pump, 9, arranged to be actuated by the motion oftwo adjacent reciprocating valve rods, 10 and 11, of the engine, 1;Preferably the pump, 9, is positioned withinthe space in which the valverods, lQand 11, are enclosed behind a removable cover plate, a 12, sothat it shall be kept lubricated by the spray or vapor of oil which isusually present in this space.

' As shown in'Figure 2 the pump consists of a cylinder casting,- 9,having an inlet passage, 13, and an exhaust passage, 14, controlledrespectively by valves, 15 and 16. The motion of the valve, 16, ischecked bya threaded plug, 17, perforated at 18 for discharge of airfrom thepurnp. The valve, 15, maybe limited as to its play inthefitting, 19,by means of the cross pin, 20, therein and said fitting isthreaded at 21, for connection' to the suction pipe, 7,'as by means ofan elbow, 22. j

Within the cylindrical bore of the casting, 9, a pi'ston,'23, is mountedforreciprocation and-its surface is formed with a pluralityof grooves, 21, to'receive and distribute oil for keeping the piston well lubricated,and also sealed substantially air tight. Outside the cylinder, 9, theendof thepiston is bifurcated at 25 and journals a plu 26, whoseitransverse bore ifits snugly .but slidably upon the rounded end, .27,of a rocker-arm, 28, fulcrumed to swing through a limited arc about theaxis ofarock shaft,

29, upon whose squared portion, 30, the arm,

28, is fastened by means of a nut, 31. The rock shaft, 29, is journaledin a bearing lug, 32, upstanding from the base .of a bracket, 33, whosedownwardly offset end, 3 1, is secured to a ledge, 35, .of the engineframe or block by a screw or bolt, 36.

The rocker arm, 28, extends upwardly from the shaft, 29, atone side ofthe bearing lug, 32, and at the other side there is rigidly secured tothe shaft a walking beam, 37, whose opposite ends engage the downwardlyextending lugs, 38, of notched fittings, 39, which are secured over thevalve tappets, 10, by beingclamped under the adjusting nuts, 4 1, of thevalve rods. Preferably each ofrthe fittings, 39, is counterbored at 4210fit over the tappet, 40, and its open notch, 43, embraces the lower endof the valve red, as indicated in Figure 5. The location of th'epumping" device is so chosen that the valve rods, 16 and 11, with whichit is associated are those whose upward movements alternate with eachother thus rocking the walking beam, 37, and the rocker arm, 28, forreciprocating the piston, 23, in its cylinder. The cylinder is rigidlysupported upon a post, 14, reduced and threaded at its lower end toreceive a nut, 15, which clamps it firmly to the base of the barcket,33, and reduced and threaded at its upper end to engage a threaded hole,46, in the cylinder casting, 9, in which it is finally locked by a crosspin or rivet, 47.

It will be understood that this extremely simple mechanism will operateautomatically whenever the engine is running and without adding anyconsiderable load to the valve tappets, 40, will produce suction throughthe pipe, 7, which will be more than adequate at all times for operatingthe vac uum feed apparatus. As is well understood, the vacuum tank, 4,includes internal mechanism, not shown, for venting its suction chamberto the atmosphere to permit discharge of its accumulated contents to thecarburetor, 2, through the pipe 3, and during the discharge intervalsthe pump, 9, will simply run idle.

Figures 6, 7 and 8 show a slightlymodified form of pump in which thepiston, 50, is sealed by means of a piston ring or packing, 51, andreciprocates in a cylinder, 52, which is closed at both ends, the pistonrod, 53, emerging through a central opening in one cylinder head, 54,for operative connection with the rocker arm, Said rocker arm isactuated by the valve tappets, 40, provided with fittings, 39, havinglugs, 38, similar to those already described, and engaging the ends of awalking beam, 37, on the rock shaft, 56, which differs from the rockshaft, 29, only in certain dimensions. Said shaft is journaled in abearing, 57, mounted on the bracket, 58, which also supports the pumpcylinder cast-ing, 59, through the medium of a U- shaped bracket, 60.

The piston rod, 53, is provided at its outer end with flanges, 61 and62, the latter being secured by means of a cross pin, 63, through itshub, 64;; the rocker arm, 55, is bifurcated at its upper end and carriesanti-friction rollers, 65, which engage between the flanges, 61. and 62,at opposite sides of the rod, 53, for transmitting motion from the arm,55, to the piston rod and its piston, 50. At the upper side of thecylinder, 52, discharge ports, 66, are positioned adjacent each end ofthe cylinder and are controlled by ball check valves, 67, caged in thecounterbores of the ports, 66, by screw plugs, 68, which are perforatedat 69 for discharge of air. At the lower side of the cylinder casinginlet ports, 70, are formed at each end and register with valvechambers, 71, in an applied fitting, 72, which contains suction or inletpassages, 73, controlled by ball check valves, 74-. Said fitting 72,includes a nipple, 75,

for attachment of any suitable coupling to connect the suction pipe, 7,which leads from the vacuum tank, 4-. As shown in Figure 8, the fitting,72, is formed with ears or flanges, 76, to receive attaching screws, 77,by which it is clamped to the valve under surface of the cylindercasting preferably with a sheet of impressible packing material, 78,interposed as shown.

The modified form of pump is thus adapted to withdraw air or vapor fromthe vacuum tank, 4, upon reciprocation of its piston, 50, in eitherdirection and this double acting form of pump may be found more suitablethan the single acting form of Figure 2 when the available strokeprovided by the motion of the valve tappets, 40, is quite short.

I claim 1-- 1. In combination with an internal combustion engine a fuelfeeding device consisting of a vacuum producing pump of thereciprocating piston type, the same being mounted upon the engine fixedstructure and comprising for actuating the pump piston a rockerfulcrumed at its lower end and having its upper end operativelyconnected with the pump piston; opposite lever arms extend ing from thelower end of the rocker transversely to its fulcrum axis into thevicinity of two oppositely reciprocating valve rods respectively; andtappets mounted on the valve rods for encounter with the opposite endsof the lever arms respectively.

2. In combination with an internal combustion engine a fuel feedingdevice consisting of a vacuum producing pump of the re ciprocatingpiston type, the same being mounted upon the engine fixed structure andcomprising for actuating the pump piston a rocker fulcrumed at its lowerend and having its upper end operatively connected with the pump piston;opposite lever arms extending from the lower end of the rockertransversely to its fulcrum axis into the vicinity of two oppositelyreciprocating valve rods respectively; and tappets mounted on the valverods for encounter with the opposite ends of the lever armsrespectively, the tappets being formed with forked stems for enteringastride the valve rods respectively between a shoulder and a nutthereon.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois,this 19th day of August, 1922.

LEONARD H. -WIIEELER.

